CMOS power-on reset circuit

Details CMOS power-on reset circuit CMOS power-on reset circuit

1989-10-30

1990-11-13

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072965, 307594, 307597, H03K 1720, H03K 1722, H03K 17284, H03K 17687

Patent

active

049704087

ABSTRACT:
The output signal of a CMOS power-on reset circuit changes state upon detecting a predetermined threshold of the power supply voltage during the start-up transient. During the power-up of the power supply voltage, the output signal of the power-on reset circuit ramps up with the power supply voltage until the latter reaches a first predetermined level whereat a control signal begins to track the increasing power supply voltage, less two diodes potentials. Upon reaching the turn-on potential of a transistor, the control signal activates an inverter to substantially reduce the output signal signifying that the power supply voltage level is sufficient for the operation of external circuitry. The output signal then disables the current flowing through the power-on reset circuit to save power consumption.

REFERENCES:
patent: 3895239 (1975-07-01), Alaspa
patent: 4812679 (1989-03-01), Mahabadi

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